Flask



FIG. 1 is a side perspective view of a flask according to my design;

FIG. 2 is a side view, each of the remaining three (3) side views being mirror images thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom view thereof.

The stippling in the drawings illustrates a contrast in appearance. 

CLAIM The ornamental design for a flask, as shown and described. 